A writing technique in which the user bases an entire piece of writing, often an essay, around a single and often small, irrelevant and/or useless piece of information.
Skilled Bullshitting will allow someone to write a full essay about nothing yet make it look as if they know what they are talking about and are answering the question.

What did you write for the essay at the end of that exam?" " I had no idea, I was Bullshitting my way through it

when you really don't want to do something or hang out with someone, so you make up excuses until they leave you alone

girl one: i thought you were supposed to be hanging out with jane today?
girl two: nah, she's bullshitting. she pretended she was sleeping when i called her even though she was on facebook right before.